Key stop



N. WHITE.

KEY STUP- APPLICATION FILED OCT. 23, 1920.

1,437,286. v Patented Nov. 28, 1922.

] vwento'a 6 $51 M vim/ 1 Patented Nov. 28, 1922;

UNITED STATES PATENT I OFFICE.)

NELSON WHITE, 0 DES MOINES, IOWA, 'ASSIGNOR TO MONROE CALCULATING-MACHINE COMPANY, OF NEW,YORK, N. Y., A CORPORATIGN OF YORK.

KEY STOP.

To alt whom it may concern Be it known that I, NnLsoN WHITE, a citizenof the United States, resident of Des Moines, in the county of Polk, andState of Iowa, have made a certain new and useful invention in KeyStops; and T declare the following be a full, clear, and exactdescripticn oi the same, such as will enable oth rs skilledin the art towhich it appertains to make and use the invention, reference being hadto the accompanying draw and to letters or figures or" reference thereonwhich form a part of this specification.

Figure 1 is a cross-section through the key board of a calculatingmachine made inaccordance with the invention.

Figure 2 is a detail sectional view of the lower portion of a key stemand parts mounted thereon.

Figure 3 is a detail perspective view of a cross PlQCQ Figure 4 is adetail perspective view of a washer.

The invention has relation to stops fori. isters, and it consists in thenovel construction and combinations of parts, as hereinaiter set forth.I

In the accompanying drawings illustrating an embodiment of theinvention, the numeral 1 designates the depressible keys of acalculating machine such'for instance as disclosed in the patent toMonroe No. 1,306,606, dated June 10, 1919, said keys being shown in saidpatent as havin stems 2 of planular or flat form and provided with lowercam 3 heads 1, acting in the depression of the keys to move pivotallyrock bar members 3, related to each denominational series of keys, andcoming to rest upon said rock bar members to limit the downward movementof the Each key has a retracting spring 4, bearing at ohe end againstthe framing or frame plate 5, and at the other end bearing against astop member of cross ,piece 8 to be described, a washer 6 of the keystem being interposed between said spring and said cross piece.

The key stemis provided with a longitudinal slot '2, and fitting neatlyin this slot is the cross piece 8, of planular or fiat 'form, having aheight about equal to the height of said slot, extending laterally ateach side of the key stem, and provided with an upper notch 8 of abreadth about equal to the thickness of the key stem, whereby when thecross piece is inserted within the notch of the key stern and raisedupwardly, the end walls of said notch will engage the sides of the keystem and the inner wall of said notch will engage the upper wall of theslot of said. stem, said cross piece being thereby fixed in positionagainst upward or edgewise movement, and the engagement of the crosspiece with said slot serving as a guide in assembling the parts and alsotending to fix the cross piece in position against lateral movement.

The washer 6 is provided with a central parallel wall slot 9 which thekey stern neatly engages, and with a second parallel wall slot. 10, atright angles to and intersecting the first named slot and engaging thecross piece 8, whereby the latter is held rigidly in position upon thekey stem. The upper wall of washer 6 has engagement with uppershouldersll of said cross piece, therebgy limiting the upward movementof the washer under the influence of the spring 4:. The spring 4 willhold the parts in proper assembled position, it being necessary todisengage the notch 8 from the key stem and to disengage the washer fromthe cross piece before the latter can be displaced.

In assembling the arts, a lower washer 12 and cushion 13, belng firstengaged with the key stem,- the latter is inserted into engagement witha parallel wall slot 14 of the frame plate from below (neatly engagingsaid slot); the coiled spring 4. is engaged with the key stem from aboveand slid downwardly thereon to said frame plate; the

washer 6 is engaged with the key stem from i upwardly to engage itsnotch with the key stem as stated, the washer being then perpermittingthe same to be made lighter in construction, A Fnrtherm0re.,the assemblyis facilitated, since all the parts are freely engageable and do nothave to be driven to place. The cross pin of the said patent is liableto'drop out unless it is driven tightly in engagement with itsperforation in the key stem which is difficult on account of the manyadjacent parts, the operator being cramped for room; whereas the crosspiece 8 being inserted in position as stated will be held securely inplace. 7

It is obvious that the invention is equally applicable to key stems ofround or other form in cross section, and that the washers 6 may beomitted if desired and the springs 4 act directly upon the cross pieces8.

ll claim:

1. in a stop device for the purpose described, a stationary memberprovided with an aperture, a stem slidably engaging said aperture, acoiled spring surrounding said stem and hearing at one end against saidmember, and a device engaging said stem and adapted in the movement ofsaid stem in one direction 'to compress said spring and to contact withsaid member to limit the movement of the stem.

2. ln a sto device for the purpose described, a statlonary memberprovided with an aperture, a key stem slidably engaging said apertureand having a slot, a coiled spring surrounding said stem and bearing atone end against said member, and a device engaging said slot and adaptedin the movement of said stem in one direction to compress said springand to contact with said member to limit the movement of the stem.

3. In a stop'device' for the purpose de-- scribed, a stationary memberprovided with an aperture, a key stem slidably engaging said apertureand having a slot, a coiled spring surrounding said stem and bearing atone end against said member, and a device engaging said slot and adaptedin the movement of said stem in one direction. to compress said springand to contact with said member to limit the movement of the stem, saiddevice having a notch engaging a portion of the key stem marginal tosaid slot and being so held by said spring.

4. lln a device for the purpose described, a stationary memberprovidedwith an aper ture, a key stem slidably engaging said apertureand having a slot, a coil ed spr1ng surrounding said stem' and bearingat one end against said member, a device engaging said slot and adaptedin the movement of said L i-erase stem in one direction to compress saidspring. and to contact with said member to limit the movement of thestem, and means adaptedto maintain said device in engagement with agaging said slot and adapted in the movement of said stem in onedirection to compress said spring and to contact with-said member tolimit the movement of the stem,

and a washer interposed between said device and said spring and adaptedto maintain said device in said slot.

6. lln a stop device for the purpose described, a stationary memberprovided with an aperture, a key stem slidably engaging said apertureand having a slot, a coiled spring surrounding said stem and bearing atone end against said member, a cross piece engaging said slot and havingahead adapted in the movement of said stem in one direction to compresssaid spring, said crosspiece being adapted to contact with said memberto limit said movement, and a washer interposed between the head of thecross piece and said spring and having intersecting slots engaged bysaid stem and said cross piece.

7. In a stop device for the purpose described, a frame provided with anaperture, a key stem engaging said aperture and having a lower head, acoiled spring fitting over the key stem and resting on said frame, aWasher fitting over the key stem and forming a bearing for the'upper endof sand spring, and means engaging the key stem adapted to fix saidwasher in position against the tension of said spring and to contactwith said frame to limit the downward movement of said key.

8. In a stop device for the purpose described, a frame provided with anaperture, a key stem engaging saidaperture and having a longitudinalslot and a lower head, a..

coiled spring fitting over the key stem and resting on said frame, awasher fitting over the key stem and forming a bearing for the upper endof said spring, and a cross piece engaging said slot and" having anupper notch engaging the key stem portion marginal to said slot andadapted to fix said washer in position against the tension of saidspring and to contact with said frame 0 limit the downward-movement ofsaid e lln a stop device" for the purpose described, a frame provided.with an aperture, a key stem engaging said aperture and having a lowerhead, a coiled spring fitting over the key stem and resting'on saidframe, a

Washer provided with intersecting slots and respectively the key stemand said member, forming a bearing for the upper end of said to hold thelatter in position. 10 spring, and a member engaging the key stem Intestimony whereof I. affix my signature and adapted to fix said Washerin position in presence of two Witnesses.

I 5 against the tension of said spring and to NELSON WHITE.

contact with said frame to limit the doWn- Witnesses: .Ward movement ofthe key, the respective ,ADELE SHERMAN,

intersecting slots of said Washer engaging RAY DAUGHERTY.

